Electrical tester



FIG. 1 is a perspective view of an electrical tester showing my new design;

FIG. 2 is a front plan view;

FIG. 3 is a right side elevational view;

FIG. 4 is a left side elevational view;

FIG. 5 is a rear plan view;

FIG. 6 is a top elevational view; and,

FIG. 7 is a bottom elevational view.

The broken line showing is for illustrative purposes only and forms no part of the claimed design. 

The ornamental design for an electrical tester, as shown and described. 